[F] Lance Formation - South Dakota - Wyoming - US
Lance Formation - called Laramie Formation in the 1870s - South Dakota - Wyoming - US
The Lance Formation is dominated by rocks of a regressive sequence consisting of nonmarine coastal floodplain sandstones, mudstones and marls, with marginal marine sandstones and shales in its lower parts. The Late Cretaceous environment in Wyoming was a warm temperate to subtropical, seasonal floodplain on the west coast of the eastward-regressing intracratonic seaway.
The Lance Formation encompasses a farly short period of geologic time (approximately 1.5 million years) at the end of the Maastrichtian. It reaches more than 750m in thickness and is found troughout Wyoming. Although vertebrate fossils are known from11 counties in Wyoming (Breithaupt, 1985), the most abundant and diverse faunas in the Lance Formation are known from Niobrara (Hatcher et al., 1907; Estes, 1964; Clemens, 1964, 1966, 1973; Derstler, 1994 and Sweetwater (Breithaupt, 1982) counties.
Agathaumas sylvestris - Wyoming - Neoceratopia Nomina Dubia - Cretaceous Late Maastrichtian
Albertosaurus sarcophagus - Wyoming - Tyrannosaurinae Albertosaurini - Cretaceous Late Campanian Maastrichtian
Anatotitan copei - South Dakota - Hadrosaurinae Edmontosaurini - Cretaceous Late Maastrichtian
Anatotitan longiceps - Wyoming - Hadrosaurinae Edmontosaurini - Cretaceous Late Maastrichtian
Ankylosaurus magniventris - Wyoming - Ankylosauria Ankylosauridae - Cretaceous Late, Maastrichtian
Aublysodon mirandus - Wyoming - Tyrannosauria Tyrannosauridae - Cretaceous Late Campanian Maastrichtian
Bison alticornis - Wyoming - Neoceratopia Nomina Dubia - Cretaceous Late Maastrichtian
Claosaurus annectens - Wyoming - Hadrosaurinae Edmontosaurini - Cretaceous Late Maastrichtian
Denversaurus schlessmani - South Dakota - Ankylosauria Nodosauridae - Cretaceous Late Maastrichtian
Diceratops hatcheri - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Diceratus hatcheri - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Edmontonia sp (1) - Wyoming - Not considered dinosaur
Edmontonia sp (3) - Wyoming - Ankylosauria Nodosauridae - Cretaceous Late Maastrichtian
Edmontosaurus annectens - Wyoming - Hadrosaurinae Edmontosaurini - Cretaceous Late Maastrichtian
Edmontosaurus regalis - South Dakota, Wyoming - Hadrosaurinae Edmontosaurini - Cretaceous Late Maastrichtian
Laelaps cristatus - Wyoming - Incertae Sedis \\\"Carnosaurs\\\" Nomina Dubia - Cretaceous Late Maastrichtian
Leptoceratops gracilis - Wyoming - Neoceratopia Protoceratopidae - Cretaceous Late Maastrichtian
Nedoceratops hatcheri - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Ornithomimus sedens - Wyoming - Ornithomimosauria Nomina Dubia - Cretaceous Late Maastrichtian
Pachycephalosaurus wyomingensis - Wyoming - Pachycephalosauria Pachycephalosauridae - Cretaceous Late Maastrichtian
Palaeoscincus latus - Wyoming - Ankylosauria Nomina Dubia - Cretaceous Late Maastrichtian
Paronychodon lacustris - Wyoming - Troodontidae Nomina Dubia - Cretaceous Late Campanian Maastrichtian
Pectinodon bakkeri - Wyoming - Maniraptora Troodontidae - Cretaceous Late Campanian Maastrichtian
Potamornis skutchi ~/~ - Wyoming - Ornithurae [Hesperonithiformes] - Cretaceous Late Maastrichtian
Ricardoestesia isosceles - Wyoming - Tetanurae Coelurosauria - Cretaceous Late Campanian
Stenonychosaurus inequalis - Wyoming - Maniraptora Troodontidae - Cretaceous Late Campanian Maastrichtian
Sterrholophus flabellatus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Stygimoloch spinifer - Wyoming - Pachycephalosauria Pachycephalosauridae - Cretaceous Late Maastrichtian
Thescelosaurus neglectus - Wyoming - Ornithopoda Hypsilophodontidae - Cretaceous Late Campanian Maastrichtian
Thespesius occidentalis - South Dakota - Hadrosauridae Nomina Dubia - Cretaceous Late Maastrichtian
Torosaurus gladius - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Torosaurus latus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Trachodon longiceps - Wyoming - Hadrosaurinae Edmontosaurini- Cretaceous Late Maastrichtian
Triceratops brevicornus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops calicornis - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops elatus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops eurycephalus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops flabellatus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops hatcheri - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops horridus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops ingens - Wyoming - Neoceratopia Nomina Dubia - Cretaceous Late Maastrichtian
Triceratops obtusus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops prorsus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops serratus - Wyoming - Ceratopidae Chasmosaurinae - Cretaceous Late Maastrichtian
Triceratops sulcatus - Wyoming - Neoceratopia Nomina Dubia - Cretaceous Late Maastrichtian
Troodon formosus (= Pectinodon bakkeri, Stenonychosaurus inequalis, ?Saurornithoides sp.) - Wyoming - Maniraptora Troodontidae - Cretaceous Late Campanian Maastrichtian
Troodon wyomingensis - Wyoming - Pachycephalosauria Pachycephalosauridae - Cretaceous Late Maastrichtian
Tyrannosaurus rex - Wyoming - Tyrannosauria Tyrannosauridae - Cretaceous Late Maastrichtian
Diplodocid indet. - Wyoming (may not come from Lance Formation) - Sauropoda - Cretaceous Late Maastrichtian
?Chirostenotes sp. - Wyoming - Theropoda Elmisauridae - Cretaceous Late Maastrichtian
?Thescelosaurus sp. - Wyoming - Ornithopoda Hypsilophodontidae - Cretaceous Late Maastrichtian
?Velociraptor sp. - Wyoming - Theropoda Dromaeosauridae - Cretaceous Late Maastrichtian
?Lambeosaurus sp. - Wyoming - Ornithopoda Hadrosauridae - Cretaceous Late Maastrichtian
Albertosaurus sp. - Wyoming - Tyrannosauria Tyrannosauridae - Cretaceous Late Maastrichtian
Ankylosaurid indet. - Wyoming - Ankylosauria Ankylosauridae - Cretaceous Late Maastrichtian
cf. Pachycephalosaurus sp. - Wyoming - Pachycephalosauria Pachycephalosauridae - Cretaceous Late Maastrichtian
Dromaeosaurid indet. - Wyoming - Theropoda Dromaeosauridae - Cretaceous Late Maastrichtian
Dromaeosaurus sp. - Wyoming - Theropoda Dromaeosauridae - Cretaceous Late Maastrichtian
Hadrosaurid indet. - Wyoming - Ornithopoda Hadrosauridae - Cretaceous Late Maastrichtian
Nodosaurid indet. - Wyoming - Ankylosauria Nodosauridae - Cretaceous Late Maastrichtian
Ornithomimus sp. - Wyoming - Theropoda Ornithomimidae - Cretaceous Late Maastrichtian
Triceratops sp. - Wyoming - Ceratopia Ceratopidae - Cretaceous Late Maastrichtian
Tyrannosaurid indet. - Wyoming - Tyrannosauria Tyrannosauridae - Cretaceous Late Maastrichtian
Tyrannosaurus sp. - Wyoming - Tyrannosauria Tyrannosauridae - Cretaceous Late Maastrichtian